4-methyl-1-pentene polymer compositions, and the laminates and adhesives using the compositions

Abstract

The present invention relates to 4-methyl-1-pentene polymer compositions. Specifically, the present invention relates to adhesive compositions comprising the 4-methyl-1-pentene polymers used in bonding a 4-methyl-1-pentene polymer layer and a polar-group-containing resin layer, and laminates obtained by using such compositions. The 4-methyl-1-pentene polymer compositions as these adhesive compositions comprise a 4-methyl-1-pentene polymer (A); and a modified polyolefin resin (B) comprising a mixture of an unsaturated carboxylic acid-modified α-olefin polymer (B-1) whose α-olefin is selected from a group of propylene, butene-1 and 4-methyl-1-pentene and an unsaturated carboxylic acid-modified ethylene/α-olefin copolymer (B-2). In these compositions, an unsaturated carboxylic acid-modified 4-methyl-1-pentene polymer (A') showing a particular modification rate and a particular melt flow rate may be used in place of (A) and (B-1). These compositions have excellent adhesion to polar-group-containing resins having the OH group and the NH group, among others. The laminates obtained by laminating a 4-methyl-1-pentene polymer layer and a polar-group-containing resin layer via any of these compositions show excellent interlaminar adhesion (average peel strength) and yet heat resistance.

What we claim is: 
     
       1. A 4-methyl-1-pentene polymer composition comprising: (a) 25 to 95 wt % of a 4-methyl-1-pentene polymer (A); and   (b) 5 to 75 wt % of a modified polyolefin resin (B) comprising a mixture of an unsaturated carboxylic acid-modified 4-methyl-1-pentene polymer (B-1) whose polymer is a homopolymer of 4-methyl-1-pentene or of a copolymer containing not less than 85 mol % of the 4-methyl-1-pentene component and an unsaturated carboxylic acid-modified ethylene/α-olefin copolymer (B-2).   
     
     
       2. A 4-methyl-1-pentene polymer composition comprising: (a) 25 to 90 wt % of a 4-methyl-1-pentene polymer (A);   (b1) 0.1 to 20 wt % of an unsaturated carboxylic acid-modified 4-methyl-1-pentene polymer (B-1) whose polymer is a homopolymer of 4-methyl-1-pentene or of a copolymer containing not less than 85 mol % of the 4-methyl-1-pentene component;   (b2) 4 to 60 wt % of an unsaturated carboxylic acid-modified ethylene/α-olefin copolymer (B-2); and   (c) 5 to 50 wt % of a butene-1 polymer (C).   
     
     
       3. A 4-methyl-1-pentene polymer composition as claimed in claim 1, which comprises 25 to 90 wt % of the 4-methyl-1-pentene polymer (A), 0.1 to 20 wt % of the unsaturated carboxylic acid-modified 4-methyl-1-pentene polymer (B-1), 4 to 60 wt % of the unsaturated carboxylic acid-modified ethylene/α-olefin copolymer (B-2), and 5 to 50 wt % of a butene-1 polymer (C), wherein the total amount of the unsaturated carboxylic acid-modified 4-methyl-1-pentene polymer (B-1) and the unsaturated carboxylic acid-modified ethylene/α-olefin copolymer (B-2) is 5 to 75 wt %. 
     
     
       4. A 4-methyl-1-pentene polymer composition as claimed in claim 3, wherein the rate of modification of the unsaturated carboxylic acid-modified 4-methyl-1-pentene polymer (B-1) is 0.01 to 10 wt %. 
     
     
       5. A 4-methyl-1-pentene polymer composition as claimed in claim 3, wherein the rate of modification of the unsaturated carboxylic acid-modified ethylene/α-olefin copolymer (B-2) is 0.01 to 10 wt %. 
     
     
       6. A 4-methyl-1-pentene polymer composition as claimed in claim 3, wherein the 4-methyl-1-pentene polymer (A) is a homopolymer of 4-methyl-1-pentene or a copolymer containing not less than 85 mol % of the 4-methyl-1-pentene component. 
     
     
       7. A 4-methyl-1-pentene polymer composition as claimed in claim 1, wherein the rate of modification of the modified polyolefin resin (B) is 0.01 to 10 wt %. 
     
     
       8. A 4-methyl-1-pentene polymer composition as claimed in claim 1, wherein the concentration of the unsaturated carboxylic acid-modified 4-methyl-1-pentene polymer (B-1) in the composition is 0.1 to 20 wt % and the concentration of the unsaturated carboxylic acid-modified ethylene/α-olefin copolymer (B-2) in the composition is 4 to 65 wt %. 
     
     
       9. A 4-methyl-1-pentene polymer composition as claimed in 8, 1 or 2, wherein the rate of modification of the unsaturated carboxylic acid-modified 4-methyl-1-pentene polymer (B-1) is 0.01 to 10 wt %. 
     
     
       10. A 4-methyl-1-pentene polymer composition as claimed in claim 1 or 2, wherein the rate of modification of the unsaturated carboxylic acid-modified ethylene/α-olefin copolymer (B-2) is 0.01 to 10 wt %. 
     
     
       11. A 4-methyl-1-pentene polymer composition as claimed in claim 1 or 2, wherein the 4-methyl-1-pentene polymer (A) is a homopolymer of 4-methyl-1-pentene or a copolymer containing not less than 85 mol % of the 4-methyl-1-pentene component. 
     
     
       12. An adhesive comprising a 4-methyl-1-pentene polymer composition as claimed in claim 1 or 2. 
     
     
       13. An adhesive as claimed in claim 12, which is used for bonding a 4-methyl-1-pentene polymer and a resin containing a polar group.